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if not modules then modules = { } end modules ['node-bck'] = {
version = 1.001,
comment = "companion to node-bck.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- beware, this one takes quite some runtime, so we need a status flag
-- maybe some page related state
local attributes, nodes, node = attributes, nodes, node
local nodecodes = nodes.nodecodes
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local has_attribute = node.has_attribute
local set_attribute = node.set_attribute
local traverse = node.traverse
local nodepool = nodes.pool
local tasks = nodes.tasks
local new_rule = nodepool.rule
local new_glue = nodepool.glue
local a_color = attributes.private('color')
local a_transparency = attributes.private('transparency')
local a_colorspace = attributes.private('colormodel')
local a_background = attributes.private('background')
local function add_backgrounds(head)
local id = head.id
if id == vlist_code or id == hlist_code then
local current = head.list
while current do
local id = current.id
if id == hlist_code then -- and current.list
local background = has_attribute(current,a_background)
if background then
-- direct to hbox
-- colorspace is already set so we can omit that and stick to color
local mode = has_attribute(current,a_colorspace)
if mode then
local glue = new_glue(-current.width)
local rule = new_rule(current.width,current.height,current.depth)
local color = has_attribute(current,a_color)
local transparency = has_attribute(current,a_transparency)
set_attribute(rule,a_colorspace, mode)
if color then
set_attribute(rule,a_color, color)
end
if transparency then
set_attribute(rule,a_transparency,transparency)
end
rule.next = glue
glue.next = current.list
current.list = rule
end
else
-- temporary hack for aligments
local list, background, found = current.list, nil, nil
for l in traverse(list) do
background = has_attribute(l,a_background)
if background then
found = l
break
end
end
if background then
local mode = has_attribute(found,a_colorspace)
if mode then
local glue = new_glue(-current.width)
local rule = new_rule(current.width,current.height,current.depth)
local color = has_attribute(found,a_color)
local transparency = has_attribute(found,a_transparency)
set_attribute(rule,a_colorspace, mode)
if color then
set_attribute(rule,a_color, color)
end
if transparency then
set_attribute(rule,a_transparency,transparency)
end
rule.next = glue
glue.next = list
current.list = rule
end
else
add_backgrounds(current)
end
end
elseif id == vlist_code then -- and current.list
-- direct to vbox
local background = has_attribute(current,a_background)
if background then
local mode = has_attribute(current,a_colorspace)
if mode then
local glue = new_glue(-current.height-current.depth)
local rule = new_rule(current.width,current.height,current.depth)
local color = has_attribute(current,a_color)
local transparency = has_attribute(current,a_transparency)
set_attribute(rule,a_colorspace, mode)
if color then
set_attribute(rule,a_color, color)
end
if transparency then
set_attribute(rule,a_transparency,transparency)
end
rule.next = glue
glue.next = current.list
current.list = rule
end
end
add_backgrounds(current)
end
current = current.next
end
end
return head, true
end
nodes.handlers.backgrounds = add_backgrounds
tasks.appendaction("shipouts","normalizers","nodes.handlers.backgrounds")
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